有时，天文学家们碰巧从侧面观察到系外行星的轨道，在这种情况下，行星在围绕恒星旋转的时候就会交替地呈现出有时光面较多、有时暗面较多。
Sometimes, they happen to see the orbits of exoplanets edge-on. In those cases, the planet alternately shows more of its dayside and then more of its nightside as it circles its star.
这些如同一面镜子，从一个侧面大致反映了当时农村社会经济生活的风貌。
These, like a mirror, from a side, generally reflected the rural social and economic life at that time.
图。1所示的是由两个平行解理面和二个锯出的(粗糙)侧面组成的激光二极管的管芯。
Figure I. 1 shows a basic laser diode chip which consists of two cleaved parallel facets and two sawed (roughened) sides.
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